deps/v8/src/base/platform/platform-qnx.cc
// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Platform-specific code for QNX goes here. For the POSIX-compatible
// parts the implementation is in platform-posix.cc.
#include <backtrace.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <ucontext.h>
// QNX requires memory pages to be marked as executable.
// Otherwise, the OS raises an exception when executing code in that page.
#include <errno.h>
#include <fcntl.h> // open
#include <stdarg.h>
#include <strings.h> // index
#include <sys/mman.h> // mmap & munmap
#include <sys/procfs.h>
#include <sys/stat.h> // open
#include <sys/types.h> // mmap & munmap
#include <unistd.h> // sysconf
#include <cmath>
#undef MAP_TYPE
#include "src/base/macros.h"
#include "src/base/platform/platform.h"
namespace v8 {
namespace base {
// 0 is never a valid thread id on Qnx since tids and pids share a
// name space and pid 0 is reserved (see man 2 kill).
static const pthread_t kNoThread = (pthread_t) 0;
#ifdef __arm__
bool OS::ArmUsingHardFloat() {
// GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
// the Floating Point ABI used (PCS stands for Procedure Call Standard).
// We use these as well as a couple of other defines to statically determine
// what FP ABI used.
// GCC versions 4.4 and below don't support hard-fp.
// GCC versions 4.5 may support hard-fp without defining __ARM_PCS or
// __ARM_PCS_VFP.
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#if GCC_VERSION >= 40600
#if defined(__ARM_PCS_VFP)
return true;
#else
return false;
#endif
#elif GCC_VERSION < 40500
return false;
#else
#if defined(__ARM_PCS_VFP)
return true;
#elif defined(__ARM_PCS) || defined(__SOFTFP__) || defined(__SOFTFP) || \
!defined(__VFP_FP__)
return false;
#else
#error "Your version of GCC does not report the FP ABI compiled for." \
"Please report it on this issue" \
"http://code.google.com/p/v8/issues/detail?id=2140"
#endif
#endif
#undef GCC_VERSION
}
#endif // __arm__
const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
if (std::isnan(time)) return "";
time_t tv = static_cast<time_t>(std::floor(time/msPerSecond));
struct tm* t = localtime(&tv);
if (NULL == t) return "";
return t->tm_zone;
}
double OS::LocalTimeOffset(TimezoneCache* cache) {
time_t tv = time(NULL);
struct tm* t = localtime(&tv);
// tm_gmtoff includes any daylight savings offset, so subtract it.
return static_cast<double>(t->tm_gmtoff * msPerSecond -
(t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
}
void* OS::Allocate(const size_t requested,
size_t* allocated,
bool is_executable) {
const size_t msize = RoundUp(requested, AllocateAlignment());
int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
void* addr = OS::GetRandomMmapAddr();
void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (mbase == MAP_FAILED) return NULL;
*allocated = msize;
return mbase;
}
class PosixMemoryMappedFile : public OS::MemoryMappedFile {
public:
PosixMemoryMappedFile(FILE* file, void* memory, int size)
: file_(file), memory_(memory), size_(size) { }
virtual ~PosixMemoryMappedFile();
virtual void* memory() { return memory_; }
virtual int size() { return size_; }
private:
FILE* file_;
void* memory_;
int size_;
};
OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
FILE* file = fopen(name, "r+");
if (file == NULL) return NULL;
fseek(file, 0, SEEK_END);
int size = ftell(file);
void* memory =
mmap(OS::GetRandomMmapAddr(),
size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fileno(file),
0);
return new PosixMemoryMappedFile(file, memory, size);
}
OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
void* initial) {
FILE* file = fopen(name, "w+");
if (file == NULL) return NULL;
int result = fwrite(initial, size, 1, file);
if (result < 1) {
fclose(file);
return NULL;
}
void* memory =
mmap(OS::GetRandomMmapAddr(),
size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fileno(file),
0);
return new PosixMemoryMappedFile(file, memory, size);
}
PosixMemoryMappedFile::~PosixMemoryMappedFile() {
if (memory_) OS::Free(memory_, size_);
fclose(file_);
}
std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
std::vector<SharedLibraryAddress> result;
procfs_mapinfo *mapinfos = NULL, *mapinfo;
int proc_fd, num, i;
struct {
procfs_debuginfo info;
char buff[PATH_MAX];
} map;
char buf[PATH_MAX + 1];
snprintf(buf, PATH_MAX + 1, "/proc/%d/as", getpid());
if ((proc_fd = open(buf, O_RDONLY)) == -1) {
close(proc_fd);
return result;
}
/* Get the number of map entries. */
if (devctl(proc_fd, DCMD_PROC_MAPINFO, NULL, 0, &num) != EOK) {
close(proc_fd);
return result;
}
mapinfos = reinterpret_cast<procfs_mapinfo *>(
malloc(num * sizeof(procfs_mapinfo)));
if (mapinfos == NULL) {
close(proc_fd);
return result;
}
/* Fill the map entries. */
if (devctl(proc_fd, DCMD_PROC_PAGEDATA,
mapinfos, num * sizeof(procfs_mapinfo), &num) != EOK) {
free(mapinfos);
close(proc_fd);
return result;
}
for (i = 0; i < num; i++) {
mapinfo = mapinfos + i;
if (mapinfo->flags & MAP_ELF) {
map.info.vaddr = mapinfo->vaddr;
if (devctl(proc_fd, DCMD_PROC_MAPDEBUG, &map, sizeof(map), 0) != EOK) {
continue;
}
result.push_back(SharedLibraryAddress(
map.info.path, mapinfo->vaddr, mapinfo->vaddr + mapinfo->size));
}
}
free(mapinfos);
close(proc_fd);
return result;
}
void OS::SignalCodeMovingGC() {
}
// Constants used for mmap.
static const int kMmapFd = -1;
static const int kMmapFdOffset = 0;
VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
VirtualMemory::VirtualMemory(size_t size)
: address_(ReserveRegion(size)), size_(size) { }
VirtualMemory::VirtualMemory(size_t size, size_t alignment)
: address_(NULL), size_(0) {
DCHECK(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
size_t request_size = RoundUp(size + alignment,
static_cast<intptr_t>(OS::AllocateAlignment()));
void* reservation = mmap(OS::GetRandomMmapAddr(),
request_size,
PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_LAZY,
kMmapFd,
kMmapFdOffset);
if (reservation == MAP_FAILED) return;
uint8_t* base = static_cast<uint8_t*>(reservation);
uint8_t* aligned_base = RoundUp(base, alignment);
DCHECK_LE(base, aligned_base);
// Unmap extra memory reserved before and after the desired block.
if (aligned_base != base) {
size_t prefix_size = static_cast<size_t>(aligned_base - base);
OS::Free(base, prefix_size);
request_size -= prefix_size;
}
size_t aligned_size = RoundUp(size, OS::AllocateAlignment());
DCHECK_LE(aligned_size, request_size);
if (aligned_size != request_size) {
size_t suffix_size = request_size - aligned_size;
OS::Free(aligned_base + aligned_size, suffix_size);
request_size -= suffix_size;
}
DCHECK(aligned_size == request_size);
address_ = static_cast<void*>(aligned_base);
size_ = aligned_size;
}
VirtualMemory::~VirtualMemory() {
if (IsReserved()) {
bool result = ReleaseRegion(address(), size());
DCHECK(result);
USE(result);
}
}
bool VirtualMemory::IsReserved() {
return address_ != NULL;
}
void VirtualMemory::Reset() {
address_ = NULL;
size_ = 0;
}
bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
return CommitRegion(address, size, is_executable);
}
bool VirtualMemory::Uncommit(void* address, size_t size) {
return UncommitRegion(address, size);
}
bool VirtualMemory::Guard(void* address) {
OS::Guard(address, OS::CommitPageSize());
return true;
}
void* VirtualMemory::ReserveRegion(size_t size) {
void* result = mmap(OS::GetRandomMmapAddr(),
size,
PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_LAZY,
kMmapFd,
kMmapFdOffset);
if (result == MAP_FAILED) return NULL;
return result;
}
bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
if (MAP_FAILED == mmap(base,
size,
prot,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
kMmapFd,
kMmapFdOffset)) {
return false;
}
return true;
}
bool VirtualMemory::UncommitRegion(void* base, size_t size) {
return mmap(base,
size,
PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED | MAP_LAZY,
kMmapFd,
kMmapFdOffset) != MAP_FAILED;
}
bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
return munmap(base, size) == 0;
}
bool VirtualMemory::HasLazyCommits() {
return false;
}
} } // namespace v8::base